He rang the doorbell. He was a bit worried.
His girlfriend said she wanted to tell him something important and he was afraid she might want to break up with him.
She had been acting weird lately, as if she was hiding something.
He knew it was kind of paranoid of him, but to be honest he had never really felt as if he was good enough for her.
As the door opened, he was reminded why.
There stood his girlfriend, in all her beauty. She was wearing a black t-shirt, that showed a generous amount of cleavage, and a pair of tight, black pants.
She also wore a choker, which emphasized her pale, beautiful neck.
She was curvy and petite. She had a pretty, round face and amazing, piercing blue eyes.
Her breasts were large and inviting, under her shirt. Her legs, while not especially long, were elegant and strong.
Her dark blonde hair was tied behind her back, with just a couple of elegant locks falling on her face.
She smiled at him and welcomed him with a warm kiss.
He followed her inside, looking at her nice, round ass as she walked.
She turned around and gave him a naughty, knowing look.
"Come with me, I want to tell you this thing right away!"
Well, she seemed happy to see him and cheerful, so it didn't seem like bad news.
He followed her to the sitting room and was taken by surprise when he saw someone else was there, sitting on an armchair.
Someone he had never met.
It was a girl of about their age, in her mid 20s. She was a brunette with slightly darker skin than his girlfriend. She was also taller and more on the skinny side, though she had a nice pair of tits (not as impressive as his girlfriend's, though).
She was wearing a white t-shirt and a black skirt.
She smiled at him and he raised his hand politely.
"Hello."
"Hi."
His girlfriend put her arm around his waist and smiled, looking from one guest to the other.
"Honey, this is Michelle."
The other girl smiled in a manner which seemed a bit weird, to him. It was as if the two girls were sharing a private joke he did not know. He felt a little uncomfortable, as he smiled awkwardly.
He didn't say anything, but his girlfriend broke the silence again.
"She attends my same university. She's one year in front of me."
"Ah, right. Another nerd, then."
The two girls giggled and he started to relax a bit. He had always been good at making girls laugh. He had the impression that without that trait his girlfriend would never have dated him in the first place.
His girlfriend sat down on the sofa opposed Michelle and he sat next to her.
For a while they just chatted away, talking about his job and their studies and other basic stuff.
His girlfriend held his hand and seemed especially affectionate with him. She kept looking at him lovingly.
He had the weird impression that Michelle was also looking at him with a certain interest, but he tried to ignore that thought. It felt inappropriate.
After a while, the conversation slowed down.
He wondered when his girlfriend would tell him this important thing. And what was the plan for the evening.
He had been asked to dress nice (he was wearing black pants and a nice shirt she had given him for Christmas) and he had noticed that both girls looked ready for a night on the town.
Truth be told, he had hoped he and his girlfriend could spend some time alone, but he could adjust to the situation. Michelle seemed cool enough.
"So, what do you girls want to do tonight?" He asked them.
The two girls grinned at each other, then his girlfriend turned to him.
"Well, actually... That is what I wanted to talk to you about. Hear me out, OK?"
He nodded, bewildered. What was going on?
"You see, Michelle has recentlybroken up with her boyfriend."
"Oh, I'm- I'm sorry to hear that." He told Michelle, who smiled and shrugged.
"Yeah, they were together for almost four years." His girlfriend went on.
"I see..." He said, getting more confused by the minute.
"Yeah, well, by the end it was pretty bad. They fought all the time and he would often cheat on her."
"Oh. What a prick." He said, sincerely.
The two girls smiled.
"Also, Michelle told me that he was never that great in bed."
He felt embarrassed and looked over at Michelle, but she was unfazed and didn't seem to mind how his girlfriend was telling him all this. She shrugged again.
"He wasn't. He kind of sucked, actually."
"I... I see."
A sneaking suspicion was starting to grow inside of him, but he tried to ignore it.
"We started talking about it." His girlfriend told him. "During the last weeks we talked about it a lot. About relationships in general. And sex."
He scratched his face, nervously.
"And she asked me about you. About how good you were in bed, if at all."
He felt himself blush, but his girlfriend caressed his knee and kept on smiling.
"I told her how great you are in bed. How you make me come... well, almost every fucking time."
He felt embarrassed, but he was also feeling proud and a little aroused. It was pretty hot, being praised like that in front of another girl. He glanced at Michelle, who now looked positively mischievous.
"You see, your girlfriend went into quite some detail." Michelle told him. "And I can't deny that I felt rather...envious."
He was starting to feel real hot all over. He was afraid he might get a boner. This really seemed to be heading where he thought it was.
His girlfriend stroked his thigh and kissed his ear.
"So..." Michelle went on. "I asked her if she'd be willing to share you with me."
Michelle now looked at him. She had big, brown eyes.
"If I could finally find out what a good fuck feels like."
His girlfriend nibbled on his ear, making him shiver. Then, she whispered into it.
"I said yes, if you were willing to."
He looked at his girlfriend, then at Michelle, then back at his girlfriend.
His girlfriend smiled at him, Michelle was attentive, almost serious.
They were looking at him, waiting for an answer. They were both very hot.
A sudden thought entered his mind. Was this some kind of joke? Or a prank? A way to test how faithful he was, perhaps?
He took a quick glance at his girlfriend's cleavage, then at Michelle's earnest expression
