Bonding with my brother in law?

Okay ladies so here’s the situation: I’ve been dating my bf now for almost a year. We met through school where his brother (who’s actually 2 years above) was in the year above me when I joined (because he stayed an extra year). I was always kind of scared of my now brother in law at school because he was one of the popular guys and he was older than me!

My bf is one of those people who when you meet him he’s instantly friendly and chatty and warm whereas his brother is the COMPLETE OPPOSITE. I don’t say he’s not nice or anything because he is a nice guy but he’s just not as easy to talk to or get to know as my bf. Also he’s not a very emotional person and kind of straight set so that kinda throws me off too!

Anyway despite this I really wanna get to know my brother in law and bond with him. My bf and him never used to get on with eachother but their relationship luckily took a turning point for the best last year and now they’re like best friends. I’m sort of hoping that we can be as close as my bf and him are. I really get on with his girlfriend too!

So anyway the long and short of this post is does anyone have any tips on bonding with my brother in law? Especially when he’s not particularly socially warm if that makes sense!! My bf suggested going out for a drink with him but I’d feel really awkward arranging drinks for just the 2 of us - I feel it would be a little artificial almost?

Has anyone had a similar experience and for any tips? Tbh I just really want him to like me and for us to get on!!!