Has it ever occurred to anyone that if you were to say, cum on a clean glass surface like a hand mirror, then let it dry completely for a couple days, then scrape it with a razor and chop it into a superfine powder, as if it were cocaine made of cum, that you could then carry it around in a small container (like a cleaned-out vitamin/supplement capsule), and sprinkle it into sexy co-worker's or crush's protein drink mixes, or slim-fast, or non-dairy creamers or anything powdered, and then watch, secretly thrilled and turned-on as they literally drink your cum without ever knowing it?
As a sexual thrill/fantasy...Would that be normal?
Of course I jest. Indeed, watching people unknowingly consume your seed would be a turn on to some, if not a lot. A well known sex-life reviver is to make love on a couch or sofa and then invite guests over, getting off on the fact they're sitting where you were doing it. I've actually pondered about whether anyone actually ejactulated into one of those liquid soap dispensers in public toilets - honestly it looks lik semen!
However most people would not actually bring these thoughts to anything more than a fantasy. It is really penultimate to rape. Forcing yourself or any part of you onto someone without their knowledge or consent is just as bad as sexually assaulting someone and if you're uncovered, then it can be charged accordingly.
However as a fantasy, yes it's perfectly normal. People get off on cannibalism, rape, beastiality and midgets all the time, and it's never wise to withhold your own fantasies in your own mind. Just keep it in your head. Excuse the pun.