How can I cum easier?

42M here, around 70kg and somewhat muscular but not in as good of fitness as I like to be (injuries, tired). I am with a loving and very sexy 35F in a committed but playful relationship for several years.

I use 10mg tadafanil (cialis) casually as a "booster" or to counteract other things. I don't masturbate super frequently currently but we do have sex daily or every other if busy. I can usually cum twice from penetration in a session with a cooldown break if I try.

I have always had a harder time cumming from oral but I really really like it. No major kinks other than just really liking sex and enjoying acting "frisky" with strong intimacy.

I use alcohol infrequently, but do smoke cannabis more often (not daily) and use lsd and MDMA in lowish doses every few weeks, usually for sexytime (it's difficult to cum with these but I expect that) and sometimes self medicate a bit with ketamine. Mushrooms give me gas. I don't take any other medications really other than ibuprofen and Claritin. I have pretty constant low intensity stress due to my demanding job but am pretty well-resourced as a tradeoff.

My partner and I have experimented this year with "soft" threesomes with a bi guy friend and are planning to play later this week with another similar MF couple. We are planning not to have penetrative sex with them but are down for oral play and massage to start and then to fuck in the same room.

I really really want to be able to cum from oral with help from new friends and also to be able to cum inside my partner before it's all over with. I really want to have a powerful cum for her and don't want to wind up like we sometimes do with the lsd or mdma where I just pound on her and get sweaty without orgasm until we call it.

I know that long term I need to make some lifestyle changes but I'm just doing the best I can at the moment. Any tips for things that I can do in the short term to improve my ability to cum?