At the end of part 2, we had finally managed to get the slim dildo into Mandy's ass and later, two of her fingers. She then jerked me off in my room.
"Brian, mom and dad are coming home today and I'd promised mom I'd be able to take the bigger dildo before she came home." We were in the bathroom after getting up in the morning and this was Mandy telling me she was running behind schedule. "I need to do some extra work on it, be a dear and get the next thickest dildo for me while I lube myself up." I did as she asked, bringing her a dildo thicker and shorter than the one we'd been using. When I walked into the bathroom, she was standing with her foot on the tub, her hand between her legs and two fingers buried deep in her ass.
"Lube up the dildo and sit it on the closed toilet lid. You'll need to hold it till I get it started." She stood astride the toilet and started lowering herself toward the dildo. "Come and put your hand between my legs and hold it" I did so and she lowered herself some more. "I'm going to take my fingers out now, you make sure it's aimed right at my hole." As she pulled her fingers out of her ass, she was almost down to the dildo, so I moved it till it was pointed at the right place. Just before her ass touched it, she pulled her cheeks apart with her hands and I saw it starting to disappear.
After a while, the whole head was in she sighed and said, "I'm now going to go down all the way on it," she said, "When my ass reached your hand, just take it away." She slowly continued to lower herself, her ass touched my hand, I took it away and she sat down fully on the toilet seat, a dildo as big as my own dick deep in her ass. "That feels so good, I'm going to stay here a while, you go and make the coffee and then bring me my panties."
It took me a few minutes to set the coffee pot up and go to her room, where I found her panties with the rest of her clothes on her bed. When I brought them to her in the bathroom, she was holding the base of the dildo with one hand and raising and lowering herself onto it, taking her hand away when she was fully down and rotating her ass on the seat. "This feels great. When I wiggle my ass like this, it goes in just a little farther. We should try it with you sometime soon. Mom will want to help us. Here, put my panties on my legs and pull them up to my knees. I'm going to get up, hold the dildo in and you pull them up the rest of the way. I want to leave it in there at least through breakfast. It feels so good."
I slipped her panties onto her legs, pulled them up to her knees and, still holding the base of the dildo, she stood up. I pulled her panties up the rest of the way and she pressed the dildo farther in, with her other hand outside her panties, and finished getting them right. "Oh Brian," she said, looking at my stiff dick, "You're so hard, we should do something about that after breakfast. Maybe I should suck you a little. You're such a help to me."
We both went in the kitchen, where we sat down to coffee and buttered toast. While we were eating, Mandy told me how the dildo felt inside her. "It fills me so full and, when I'm sitting and moving my ass, I feel the tip touching something inside me. It's great. I can hardly wait to feel Justin's prick in there. It's bigger than this dildo, so it'll be even better."
