"Babe. Is that you??" she called from upstairs.
"Yeah, it's me!" he replied as he closed the door behind him.
"Oh, good, come upstairs. I have your birthday surprise." she called out.
Kicking off his shoes, he walked up the spiral staircase and found her standing at the top of the stairs in a corset, suspender belt with stocking and super high heels.
"Mmm, I like my surprise already." he said, feeling his dick harden as the sight of her.
"You wait till you see the rest of it." she said teasingly, reaching out to unbutton his pants. "There's more waiting for you in the bedroom." She pushed his pants to the floor and pulled him forward so that he stepped out of them. Then grabbing his ever increasingly hardening cock, she led him towards the closed bedroom door.
"What's in there?" he asked.
"This." she replied as the door swung open. In the bedroom stood another woman, dressed in a baby doll nightie and g-string and holding a black 8 inch dildo.
"Oh god!" he moaned as he realised that his girlfriend has invited over their playmate to have some fun for his birthday. "Happy birthday honey." she whispered, leaning up to kiss him hard on the mouth, while at the same time, their playmate walked over and slid a cock ring over his dick.
As the playmate stood up, she fondled his girlfriend's breasts and kissed her softly. "Now, fuck me!" his girlfriend ordered, breaking away from the playmate. "And make me cum".