I got over around 9 o'clock. They were just sitting on the couch lounging, having a drink. Kate was wearing a skirt with a loose sweater... first thing I noticed is that I could see her nipples through it, so no bra. Though that's not unusual for her, especially around the house. The whole ensemble really accentuated her curves. Alena was just wearing some black jeans and a tank top, almost looking like someone from the cast of Grease.
I settled onto an arm chair, they got me a whiskey, and we made some small talk. It felt surprisingly normal. Kate broke the ice, and asked "so, now that this is staring you in the face, are you still up for it? Feeling good?"
"I'm feeling very good," I replied, noting Alena's hand, which had been resting on Kate's thigh, started climbing until it was pushing her skirt up. "Do you have any last minute things you want to talk about?"
Alena glanced at Kate before she answered. "No, we're both feeling very good about our plan. I'm just a bit sad I'll have to turn in my gold start after tonight!"
"No you won't!" I laughed, "You're not having sex with me, remember? I'm using your body to masturbate."
"What do you think, Kate?" Alena teased, her hand pushing the hem of Kate's skirt to the point that I could see her entire leg. "Do I get to keep my gold star?"
"Definitely, love." Kate replied, and then leaned over to kiss her wife. Then kissed her again, harder. They started making out, and Kate swung her leg over Alena and started straddling her as they kissed. As she moved her skirt flounced up, and I could see the bottom of her ass - so either no underwear or a thong. I remembered what Kate said about liking to be watched, and sat back to enjoy, with my cock already getting pretty fucking full feeling. It's funny, I though the whole sister thing would either weird me out a bit or turn me on a lot from the taboo, but in that moment, she was just a sexy lady I got to watch making out with another lady.
Alena reached under Kate's sweater and started to pull it off, but Kate grabbed her by the wrist. "Settle down," she purred, then glanced over to me. "We're going to head upstairs now. Head up whenever you like, but give us a few minutes to get into it before you come in. We've left some supplies for you."
I heard them walk up the stairs, and the door close. I decided to sneak up right away, trying not to make too much noise on the stairs. Fuck, am I a voyeur too? They have a little nook up just off from their bedroom door near the second floor landing, and they had put a towel over the chair there and had some lube sitting next to it. I didn't need another cue, and started stripping off, but didn't sit down in the chair. I crept to the door, listening. I heard moaning, and rustling. I couldn't tell who was who. I heard muffles voices, then a gasp, which I think was my sister.
Even though we made this more of an 'enjoy-the-sex' thing than a 'just stick it in' thing, we had agreed I'd get close before I came in. I'm uncircumcised and don't usually use lube when jacking off, my foreskin tends to be enough, so I left it there on the table, and listened at the door, and started stroking my shaft. As I've said, I think I'm about average sized. I've had partners compliment my girth, but I think that's just something people say to dudes.
At this point I hear what is unmistakably Kate's voice saying "Oh fuck, god you feel good." I start hearing some wet sounds as well. I start to have the build up, tingling feeling in my balls, not edging yet, but building. My mind is flying around with images, aided by the fact that I've seen them both naked before. I start imagining what it's going to feel like to push into Alena, and it's starting to get me closer. My mind also keeps going back to the lower part of Kate's ass under the skirt - somehow being partially covered was so much sexier than fully naked, and what she said about getting wet while we're at the beach together. I briefly allow myself to imagine her pussy wide and open for me too.
I decide I'm close enough. I knock. There's a pause while they change positions, and I hear Kate start moaning. I push the door open.
It was dim in the room, lit only by candles on their bedside dressed. The first thing I saw was Alena's ass in the air, her hips flexed, giving me full view. And full access. I see her face buried between two white, full, milky thighs, and I hear Kate moaning. I keep stroking as I walk in, and... man, it was so hard not to kneel down and start lapping at Alena's pussy. Her lips were so engorged, and wet, dripping wet. I've heard that phrase before, but never seen it, until now - her wetness had matted her bush a little bit, and I literally saw a drop of grool fall from her clit. I was in heaven.
As I approached, still stroking my cock, Kate came into view. Her hair was making a star around her head, here eyes were closed, her breasts are big enough that they kind of fall off to the side a tiny bit. She was grasping one nipple while her other hand was gripping Alena's short hair, pulling her face into her pussy.
This was it. I put a hand on the small of Alena's back ( just to let her know I was there, and she let her belly drop even more to pop her pussy out. I guided the tip in, and, fuck, I was in heaven. Her kegals were so strong... I'm not going to play into this "tight lesbian who hasn't had dick" trope, because I know she's had dildos much bigger than me, but I'm not sure I've ever felt that hot, wet, and enveloped in my first thrust. I went all the way to the hilt in one slow go, keeping my hand on the small of her back.
Without taking her head out from my sister's thighs, she let out a really deep moan. Kate was right, she really likes getting filled. Her pussy was so wet that when I pulled back my balls wanted to stick to her, which felt amazing. I started going at a steady pace. She stopped licking Kate, and put her head into the bed, forehead down. At this point I looked back up to Kate's face, and her eyes were open, looking at me. We made eye contact. She was still stroking her nipple, and scooched up a bit, so I could see her wet pussy. She started stroking her clit, still making eye contact with me. That's when it really hit me. I got to imagine, whatever else was true, that my sister was rubbing her clit for me. And that was so hot.
But I don't know what was wrong, I wasn't feeling that build up anymore. It felt really good, but there wasn't that pressure feeling building in my balls - I think my body got confused with the huge shift of sensation from stroking to fucking. I tried to slow down a bit, to get some more build up, but as soon as I did Alena started bucking on her own, pushing herself back onto me at a faster pace. I decided to just stand there, let her fuck onto me, close my eyes, and enjoy it.
I opened my eyes when I heard a rustle - Kate had moved, she was now laying 90 degrees from us, her face under Alena's face, and they were making out, with both of Kate's hands cupping Alena's cheeks. One hand then started to roam down Alena's body, cupping her breasts, then Kate shifted down a little bit, so she could rub Alena's clit. Now their bodies were kind of making a V still face to face, still whispering, kissing, it was so fucking hot.
Feeling Kate's finger pressed to Alena's clit as I was fucking her started that build up again. I could feel it - I was going to fill my sister-in-law up while my sister played with her. Kate's knees were bent and pretty near by, and I remembered what she said about having some human connection, and reached out and stroked her knee and her thigh a bit. Then I felt a change - this was the first time something had been done to me this entire time... Kate shifted her hand so her middle finger was against Alena's clit, but her ring and first fingers were down, so my balls stroked against them each thrust. As she rubbed Alena's clit... or maybe on purpose, just for me, she also started kneading a tiny bit.
This sent that buildup into overdrive, and I grabbed Alena's hips, and started controlling the pace completely. My fingers were digging into her, and I heard her say "Oh fuck oh fuck" into Kate's mouth. They stopped kissing, and Alena buried her face into Kate's neck, and Kate pulled her down with her free arm, her fingers still stroking us.
