What to do at this point?

I’ve been using my helix syn V for a few weeks now. I have got to a point I can reach regularly where I can feel my prostate (?) Swell up and get hard, similar to an erection but inside, along with high state of arousal and feel goods. I can get here with it off or easier with the lowest vibe setting. I don’t know at this point whether I should try to contract and push the aneros against it, hold light contraction for that “tickle” feeling, or try and relax all contraction.

So far contracting hard makes my legs buck and bounce and sometimes that motion upsets the contact to the happy spot. Holding the “tickle” feels AMAZING but eventually something moves inside and it stops. The relax completely kinda makes me lose the happy feeling.

Advice?