I mean, it makes sense, given his backstory. He grew up in a brothel spying on his moms having sex and "studying" the technique. For the girl he's fucking, it's just a roll in the hay, but for him? He's got the mindset of an Olympic Athlete with only one shot at the gold, and by god, he's gonna set a record or die trying.
(Which is a rather silly attitude to have, tbh. Cishet men, if you want to be better lovers, 99% of that is listening to your partner's needs and don't let it hurt your feelings that she'll probably get more pleasure from your mouth and fingers than she ever will from your dick inside her. There's no amount of hip-movement technique you can learn that will make a woman be able to go from zero to multiple orgasm with your penis alone, and your desire to do so is just pure ego.)
(But of course, Lassie is a hentai protagonist, not a real person, so he totally *can* satisfy a woman with just his penis through thrust technique alone, which is better than any other penis because it's 15 inches long. Not like, y'know, anyone who gets penetrated on the regular knows that would just hurt like a bitch.)