Mangas

The fate of the world rests on one man's shoulders. Or, to put it more exactly, it rests on his balls.In a freak sealing accident the Queen of Terror is sealed into Satou Kohta's balls, thus preventing her from reigning destruction on the world. However, a lesser devil, Elyse, has been sent up to Earth to release the Queen at all costs. The only way to do so is to make Kohta ejaculate, and Elyse only has 30 days to do it.The battle for mankind has begun, in Kohta's pants.

From MangaHelpers: Rinosuke's useless and vagrant father is now dead. Now, at the age of 16, he is completely alone and will have to quit school to survive. On the night his father dies, a naked woman with large breasts falls from the sky and lands on top of him. She introduces herself as Sakamoto Marina, the future wife of the future Rinosuke. She states that she used a time machine to come back to the past, and start a new life with the younger Rinosuke. Rinosuke's new life with his future(?) wife begins.[DrCoke]

Yurika attends a girls-only college with a long tradition of lesbian love, and according to rumors, she's been with over half of the 10,000 girls who attend the school! This rumor is mortifying to Yurika, and seriously damages her chances of ever getting a boyfriend. The truth is, for some reason, she's just completely irresistible to women, even women who claim to be straight. One day, Yurika gets a call from her Dad, letting her know that his company is bankrupt. He suggests that she get by on her charms, since he can no longer help her with money. Is it time for Yurika to actually start taking advantage of her unwanted persona as a masterful lesbian lover?