My papa (a male supporter) in his 70s persistently tells me to use my tongue when we kiss.

I try to put up with how gross it feels and kiss him the way I would kiss a boyfriend my own age, but apparently that isn’t enough for him—he holds my head in place and pushes his tongue into my mouth. I’ve been watching YouTube videos to learn how to deep-kiss and trying to accommodate him, but apparently I’m still not meeting his expectations. I think I’m using my tongue while trying to follow his requests, but I’m not improving much and I’m reaching my limit. Could anyone tell me what kind of kissing techniques older men tend to prefer? At least none of my boyfriends or anyone I’ve dated before has ever asked me to use my tongue so excessively. This man especially likes penetration while kissing and having his private parts stroked by hand, and these are always required. Once I do that, he ejaculates almost immediately. If any female members have tips or techniques for the kind of kissing older men prefer, I’d really appreciate your advice.