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: so, long story short..

my fwb tried to be sexy and use some lubes/scented lotions last week.  i figured it'd be cool and nice to try something different and mix it up a little bit..  he puts on this nice scented lube, it's like a sweet plant or just relaxing smell, i'm not too familiar.  slides in my bum and goes at it.  all was well for about 10 minutes until it started hurting..

it felt like he was shoving a razor blade in and out (like, seriously, fucking bloody hurt).  i had to push him off and realize my ass was turning all sorts of red.  i couldn't tell if it was my ass getting it too hard, or what was going on.  we finished up and called it good, yet my ass had this aching pain...

for the next 2 days (it's precisely 1 week after currently) my ass was slowly hurting more and more, it was like a giant rash formed in my bum.  i went to my usual doctor, who then examined everything (yes, with the finger) and gave me the news.

"you said it was during sex, and you aren't experiencing any stds symptoms, so what exactly happened?"

i detailed the experience and he had pin pointed that it was either the condom was too rough, or the lubricant.  at that point, i had no idea what kind of lube or condom it was, so i called him up and found out... it was fucking aloe vera lubricant.  i guess he forgot i was allergic and said it was good for the skin....  in reality, i'm extremely allergic to aloe vera.  my skin always breaks out or rashes over and causes hell... 

i told my doctor that and he pretty much told me to wait it out... and no sex for a month.  one week later to-date and my ass is still sore, but i can finally sit a bit more normally.  i hate everything.

TIFU by using a lubricant I'm apparently allergic to.