You split on her

Since you already knew that Kelly was pregnant, you figured there was really no reason for you to stick around, so you slip out of her bed and leave her a note on the night stand, slipping off after the deed was done.

"Later Kelly," you tell her as she sleeps, oblivious to the fact that you are leaving her alone to face her pregnancy on her own, "I came, I saw and I conquered your pussy. But now I must be going, baby."

Dropping the note on her nightstand, you slip out the door of her hotel room and head back to your own room to get a good night's/early morning's sleep, hoping she won't try to track you down.

"Hey baby...where did he go?" Kelly moans as she reaches out for you the next morning, panic setting in when she realizes that have split on her and left her to handle her pregnancy on her own.

"THAT SON OF A BITCH!" she yells out to no one in particular, finding your note and reading it out loud:

"Dear Kelly, I want to thank you for the great pussy you gave me tonight. Hope you think of me every second you're pregnant, because from the second I saw you last night, it became my goal to fuck you. The fact that I have undoubtedly knocked you up is just icing on the cake. Tell your husband I said "thanks for the pussy", and take real good care of my baby."

"Come on Kelly, think this through," she tells herself, trying to get her thoughts together, "he's probably staying in this hotel somewhere. Go find his room and make him face the music."