... is to
read deeply, back through this discussion board as it has already been described, frequently, and in detail.
Your situation is fundamentally identical to the majority of people who come here with their problem. There are two components, the circumferential tightness of the foreskin which restricts retraction - more so when erect - and the short frænulum which limits how far you can retract once the foreskin
can slip over the glans (head).
In
your case - and it is not unusual - the short frænulum seems to be far the more troublesome problem, and the "exercise" Jim points to is the important one. When you pull your foreskin back, you want to identify the spot where the frænulum
ends in the foreskin. Then pull your foreskin forward again while you note - or take hold of - that point. That is the point you need to grip to pull on, and you pull enough to make it uncomfortable, and pull for longest time you can, continuously, on each occasion. This should take one hand to do - the other end of the frænulum is anchored to the penis (just under the glans) and you do not need to grip it.
Oral sex is interesting (to say the least)! Performed on a male, it is actually very difficult and/ or ineffectual. Of course, if the
situation is sufficiently exciting,
any form of sexual stimulation will readily obtain a "result", but (do correct me if I am wrong on this ...) it is really very difficult for the young lady to both envelop the penis (glans)
and stroke it (by head movement) with anywhere near the rapidity needed. What usually eventuates, is that the foreskin (or shaft skin if circumcised) is manually stroked against the glans while the glans is (rather pleasantly) held and manipulated in her mouth.
What I am suggesting is that whilst you
do want to achieve more comfortable retraction, that will not necessarily greatly change the method or nature of oral - or other - sex.

Of course, we basically
never advise "a small surgical procedure" to "fix" any of these problems. People rather naïvely fail to appreciate the implications of surgery, particularly the duration of the recovery period, on such a mobile and
functional - and
sensitive - body part. We estimate that with due diligence, the stretching that we prefer to advise, would achieve the same degree of comfort in the same time it would take to
adequately recover from surgery.