Definition: In this task, you are given a Reddit post as a text. Your task is to generate a title for this text. The title should start with "TIFU by", followed by a situation that caused humor. The title should contain 7-12 words, ideally.
Input: Text: tifu by getting a blowjob on the porch. so this happened last week.little background info, i'm 17 and my girlfriend is 15 and we have to watch her sister at her parents. so i was at my girlfriends  sitting on the couch when she starts rubbing my dick. she motions me to go outside. we go outside and she starts sucking me off. this goes on for about 10 mins. she keeps going and i'm about to cum, i start cumming in her mouth when all of the sudden i hear "hi". her little sister is standing the doorway. just watching. i quickly put my dick away and act like nothing is happening. i am terrified that she is going to tell her parents. 

tifu by getting a blowjob on the porch while her sister watched us.

TIFU by getting a blowjob on the porch.