https://www.dlsite.com/maniax/work/=/product_id/RJ01185981.html
https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_347020/

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[Synopsis]

This is a story about a school attended by elves from another world...
On his way to school, Oliver, who attends the school, passes by Arika, the daughter of the school's chairman and a perfect young lady, who makes fun of his appearance.
Angered, Oliver tries to steal her underwear while she is swimming but he runs into her when she finishes swimming early.
Oliver is worried but he has some orc genes in his genes and his constitution puts Arika in a state of heat, causing him to attack her.
Later, he proposes a bet, using a sex tape as an excuse to see if Arika will fall in love with Oliver within a certain period of time.
Arika is overconfident, thinking there's no way she'll fall in love with a guy like that but she gradually becomes captivated by his constitution and techniques...

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