Welcome to the teenage bunny months! The honking is his "bunny love song", and the humping is perfectly normal for a teenage male rabbit (as annoying as it can be).
The hormonal behavior will settle down as he matures - Scone MacBunny used to try to hump my arm from the time he was six months. Once he reached maturity at about a year he was much calmer.
You can't "discipline" him, but you can try training him that you are not an appropriate love object, or at least, not in that way. When Scone started to hump my arm, I pushed him back gently and said "NO! Only kiss!". He'd try again, repeat "NO! Only kiss!", and so on - I never rejected him, or put him on the floor or anything, just made it clear that that was not how I wanted to be approached. After about three repetitions he'd hop up tentatively and kiss my hand, and I'd praise him extravagantly. It took a few weeks or more, but after a while he learned that Dad appreciated his love, but humping was out.
It might help to give Skip an outlet for his desires. Scone had a yellow stuffed bunny "girlfriend" named Butter which helped a lot, although he wasn't exactly monogamous. Any stuffed animal with upstanding ears would be knocked flat and humped, including a huge stuffed bunny which he could never quite get on top of. He never was neutered, and lived happily humping anything in the house with uppy ears for seven and a half years.