Imo a pillow aint gonna prepare you either. Its not the motions that are gonna make you nut fast, its how warm and wet it is. Like a hug surrounding your penis. Have more sex, safe sex, get better at it, have fun. If you feel like you're gonna nut and don't want to, pull it out and go down on them or use your fingers for a while to cool off. Rinse and repeat, definitely helps train the tolerance. But if you put it in and immediately say 'oh fuck', enjoy the next 12 seconds.