I want to have sex with my friend, but there’s a big problem.

Now I know it’s not good to have sex with a friend and a friend you used to have feelings for, but I’m the type of person who likes to feel things. I find him very attractive and I used to like him a lot but with time and doing things with other people those feelings have subsided a bit. Now the thing is we have great chemistry and for a while sex has been bland and I haven’t been enjoying it as much. Recently we’ve been talking more and the topic of sex comes up a lot. The things he talks about is everything I want and I just want to experience it myself.

Now the problem is a couple days ago he said no girl could handle him because he was too big. I asked for his size and he said around 10 inches. Now I look at his crotch a lot and I would’ve never guess that. I think he might be overestimating as he said he used his phone to measure so it’s def more than 6 inches. I’ve never been with anyone over 7 inches and those I can manage with slight discomfort but I can take it for a bit. He says he’s never been satisfied because of his size and I want to please him but if I can’t do a good job I feel like it would make our relationship weird. Any tips on what could help?

Also just to add in I joke around about wanting to have sex with him but I think he just thinks I’m being playful. I have no idea if he wants to do anything serious with me and we don’t have any plans to I was just curious.