vekruznof course your interest will subside......it does naturally for any people (men more than women), but try concentrating on enjoying the cock in your mouth..and joy of giving without payback, it's a win-win...he gets more pleasure and you become less selfish.......sex is about both partners, no just your enjoyment,,,,try that, and good luck.........also resting a while can renew interest....lay together awhile before you think of skipping out on them...good luck