Hunter: Space Pirates

At the tender age of three, our protagonist is separated from his mother under mysterious circumstances. A compassionate couple of neighbors, mourning the loss of their own son, adopt him. His foster father, a former Navy combat pilot known as "Viper," nurtures his passion for airplanes. However, tragedy strikes when the couple is killed by a hungry Grizzly bear. Now, on the cusp of adolescence, the boy is sent to a foster home where he must navigate life surrounded by four women. His journey to discover his true self is accompanied by a series of encounters with the girls at his foster home, each interaction shaping his understanding of relationships and desire.

[From Itch.io]