You would be the one to ask the first time you put makeup on Jabber. He doesn't really care, gets a little curious about the eyelash curler and almost scoops his eye out. Whoops!
He asks about every product the whole time, "What's this do?" "That looks like it'll burn my eyes." "Hey, I'm into some freaky shit but don't glue my eye lashes together."
The whole experience is relatively calm, which is super surprising to you.
Jabber's usually all over the place and doing something to intentionally get himself hurt, you genuinely didn't think he could sit still for this long.
He actually loves it, though.
He always avoids normal forms of interactions and affection because he doesn't know how to slow himself down -- he's always going and he's been like that for so long, he feels like no one will see him as him if he stops.
Jabber knows this is the one time he can stop and it won't be questioned. His lovely gf is doing is makeup and everyone knows he'd do anything for her. Sitting still for makeup is a win-win scenario for you both.
You're getting to see you're boyfriend all dolled up and pretty, and he gets to slow down without talking about wanting to slow down.
At the end of it, he's readjusting his hair from on his shoulder, to over his shoulder -- back and forth, making different faces in the little handheld mirror you have.
"Baby, you made me look so hot. People are definitely gonna hit on me."
"...do you mean that in a flirting way or a violence way?"
"Can't I have both?"
Every time after that, Jabber is the one asking you if you can do his makeup. At this point you have a second makeup set and skincare set just for him, and even offer to teach him so he can do it on his own.
He disagrees heavily at this notion, "I don't wanna wear it every day. I want you to do my makeup. I like having you touch all over my face and stare at me for hours, it's the closest I'll ever get to you stalking me."
"Jabber, what the actual fuck."
In conclusion, Jabber would be super down. 100% ask him, he'll always say yes and he'll always give you the reactions you want (and don't want, he's still a fucking weirdo).