You arrive home and your girlfriend Claudia is waiting for you in a robe. “Happy birthday” she says with a grin. She drops the robe to reveal she is wearing skimpy black lingerie underneath, showing off her muscular physique. She explains when you told her about your muscle fetish she wasn’t sure if she could get into it, but it turns out she’s loved gaining muscle at the gym. She flexes for you, while explaining how much it turns her on to see you getting hard for her muscles. Claudia encourages you to stroke for her, until you cum, shooting over her biceps so she can lick it off.