Spicy mature manga

"The Content of Adults
There are trillions of cells in the human body, and they all have to work hard to keep the body alive. But what if that body isn't taking great care of itself? What if that body smokes too much? Or drinks too much? What if that body forgets to use protection? Why, it might find itself with all manner of dysfunctions, and who's going to have to pick up the pieces? It turns out the same immune cells that fight off the common cold also have to deal with troubles of a distinctly more adult nature. . . "

Escape Journey
"It's Naoto's first day of college, and the last person he expected to see was his high school ex Taichi, whom he'd dumped after a huge argument. Even though years have passed, Naoto finds he's still steamed over some of the harsh words that were exchanged, but he also recognizes how much Taichi has matured since then and can't help getting pulled back in. Will the discovery of his friend's crush on Taichi fray the fragile threads of this