Putting the tip in

so tomorrow I plan on having sex with a new fwb. we were talking and he told me he wanted to put the tip in my ass and I told him many times no and he said he was gonna do it regardless. I know he's being an asshole but then he was like okay I'm not but I'm gonna ask tomorrow again to see if you're into it. so I just want to now for you ladies who have had the tip in your butthole how bad it hurts or how it even feels?
UPDATE: wow Im very thankful for the amount of responses this post has gotten. I will not be continuing this fwb relationship with that guy. y'all have made me realized that I should atleast trust the person I'm having sex with. thank you!!!