This is my first fanfic so any constructive criticism is welcomed. This is rated M for a reason heavy smut. You have been warned! If you find it offensive don't read and don't review.
Lily has been living with Barney for a week now pretending to be his wife. Yesterday she woke up in bed with him. She kind of liked the warm feeling of sleeping next to her friend of 4 years. She wanted a bit more but before she could Barney woke up screaming so she played along pretending it was a mistake. She was still aching to be that close to Barney again so when she knew Barney would be home from work any minute she got changed into Marshall's favourite lingerie. It hurt for her to think of Marshall after he rejected her but now all she could care about was Barney holding her. Being with her. Fucking her. She got wet just thinking about it, but she didn't have to think about it anymore as Barney walked through the door.
Before Barney could register what was happening Lily had jumped on to him passionately kissing him and she wrapped her legs around his waist. Once he finally got to grips on what was happening and what was about to happen he kissed her back. They were in Barney's bedroom almost instantly. He threw her onto the bed and when he saw what she was wearing he got an erection instantly. Lily saw this and knew he was on board. He had already taken off his tie and now she was working on his shirt. While she was doing this Barney lowered the top of her lingerie and started working on her breasts. She let out a moan of pleasure and that spurred Barney on, he got more aggressive and started fingering one nipple while biting on the other. Lily gasped and she wanted more, so much more. Once Barney's shirt was on the floor she took of his pants. Now there he was just standing there in his underpants fondling her breasts. It was then that she realised she had always wanted to be with Barney Stinson. She needed him now. She was sick of the foreplay.
She got Barney to stop playing with her breasts for a second so she could get the annoying restricting lingerie off her. Now all that was separating them was Barney's underwear. That was gone in a flash and now she could see his bulging 9 inch member in front of her face. She can't take it anymore. She straddles him reaches down and places his member in her centre before slowly riding him gradually picking up the pace until they were fucking as hard as possible. She knew she was close. She also knew he was close judging by his moaning. "You can cum inside me. I'm on the pill." And he did. It was the best sex she had ever had. It was ten times better than her best with Marshall. "Do you wanna go for round two?" Barney asked and the only answer she gave was that she started kissing him again.