Beyond the Timescape - Chapter 554: Freezing Time (part 2)

Lin Mu is the number one genius of Jade Sect—handsome, elegant, and peerless in cultivation. Revered by elders and envied by peers, he stands at the top in every way… except the one that matters most to his lovers.He is small. Quick. Weak. In bed, he’s a failure.And everyone in the sect knows it.Women fall for his charm, only to leave his bed aching and unsatisfied. His first wife, Xue Lan, still loves him—but seeks her pleasure in the arms of others. Soon, more women join him, enchanted by his beauty and tenderness, only to find satisfaction in stronger, rougher men......WARNING: [Netorase], [Cuck], [Cuckold], [Netorare], [SPH], [Size Comparison]

Some say reincarnation is a blessing, but for me, it's a dreadful curse. Cursed with endless reincarnation, I've been reborn as a villain 137 times. And all 137 times, I've been toyed with and killed by heroes who are far more cruel than the said villains... If I can't win no matter what I do, then I'll crush those so-called heroes at their very roots. - Quality Fan Translations, Made by Fans for the Fans - Villain Takes Over The Academy

This book is also called “The Unscientific Ninja Master of Sand Ninja Village”.

“Gara, come on!” “When oil is dug, Sand Ninja Village will explode.” Gaara was puzzled. He was outraged. ”

Teacher Mu Feng, shouldn’t hard work mean hard work in cultivation? You always ask me to dig sand and find oil for cultivation. ”

“Scientifically speaking, digging sand is a very good exercise.”

“Just dig hard. If oil is dug, everyone in Sand Ninja Village will have a white cloth on their head. I will be the richest in the world.”

- Description from novelbuddy

The Student Council President’s Secret Laid Bare (生徒会長のセキ裸ラな秘密) is fairly standard 2D Dream Bunko fare but with an exhibitionism theme.

Basically, it’s about a guy who discovers the student council president is an exhibitionist and gets roped into helping her with that fetish.