It's short one, but I'm curious: Probably, in the past, you just stroked and stroked. You know that I want more creativity and sensuality from you, than dumb stroking all the time.
What I want you to practice: You are only allowed to caress the upper part of your glans, that sensitive part on the opposite side of where your frenulum is. You may also touch the fringes, but not the frenulum and no stroking.
Try to c.u.m this way. For me.
And report, best here in comments, or in dm!