How to have good sex or be good at it

Ik it’s a lot of enthusiasm and putting in prt of the work.

Lots of times I’m not really in the mood for sex so I just do it to please him. And I’m new so idk how to ride and I try but I’m slow.

And I’m allergic to his cum so I can’t swallow anymore or my throat closes. He’s came in my butt before but now I’m worried I’ll go into a serve allergy attack if he does again. (Allergies can get worse out of no where even if it’s never effected h much before. As my doc says)

So giving him butt stuff I get too scared now.

Idk what to do. I feel like he’s gonna get sick of this real quick. I wanna learn but again I’m a slow learner and shy