Sex with a fat guy?!?❤️

Advice me please ,I’ve been dating this guy for about a year and we’ve never had sex (abstinence) but I want to be prepared when the time comes. Do big guys have big penises ? Can they do doggy style? Should I take the lead? Do I go down on him ?If you’ve had sex with a “fat guy” please drop your story below

Edit : I love my guy Lol NO PROBLEM with my big man I just need advice on how to please him