Warm fudge ice cream cone
When penetrating your girlfriend up the ass, you tap on her back to give her the signal to proceed to poo over your dick like an ice cream machine and you continue to penetrate her until her poo gains a fudge like consistency around your penis and then she licks and sucks it all off your dick - your dick is the ice cream cone.
Damn! Have you heard about Kieran? The Warm fudge ice cream cone he gave Sam for dessert after their meal together?