So....he has this ability to make these girls sexually active who despite being obedient, don't feel anything sexual towards their master.....
BUT he will be blocked every single time for random (some logical) reason just so the writer can keep this "lucky but still a virgin plot".....or probably a "despite this unknown ability, he will keep his virginity until he lands the main heroine".
Hmm, sounds a lot like that one magical girl manga where despite the MC constantly saving the main heroine, other girls interested in him and end up with broken bones or near death.....he gets no action because shit always happen and the MH despite having feelings with him, and don't want other girls near him.....also don't do anything for him. *sigh* It's pretty sad that despite this power, it's random guys who get more lucky than this mc. Though F for all the guys affected by this....they have been unknowingly NTR'd without actually being NTR'd lol