Tired but Tempted

You're a hard worker, and you're always busting your ass. You work full-time and have a side gig, so you're always tired, and your girlfriend Sisi Rose has noticed. On the one hand, she appreciates your work ethic and that you always provide for her. On the other hand, she's super horny and needs your huge dick inside of her. She's dressed in skimpy lingerie and wants to make you feel good. You just sit back and relax while she takes care of you. Sisi is so beautiful that you're hard as soon as she whispers "I want you to fuck me." Yes, your body may be tired, but the spirit (and the cock) is more than capable of taking her to poundtown. What are boyfriends for?