Got this good-condition softcover online. It features several stories that all seem to be excuses for big tall men to have lots of sex with cute young ones, with only the thinnest of storylines. First there's young ninja-in-training Subaru, whose master Yuuzuki wants to train him in the arts of seduction - something he'll need for an upcoming mission. To nobody's surprise, both parties find that they enjoy the lessons - and each other - so much that they don't want Subaru in anyone else's arms. Another story about that couple has Subaru undertaking a mission of his own; he gets the bright idea to steal the enemy's uniforms! Turns out he mistook an ordinary high school for a ninja training camp - but luckily his master likes the look of him in schoolboy-drag {wry grin}.

Another ninja couple takes the forefront in the next stories; here, the younger guy is the more forceful one, and both men offer hints that it's in the nature of their business that one might betray the other someday - which might have made for a more interesting story, but it doesn't happen here.

The final story breaks from the "ninja" theme and has a young man, lost in a snowstorm, rescued by a handsome snow-spirit - who's had to change him into a snow-spirit too, to save his life. But apparently that's against the rules, so he has to be changed back to human again while his spirit-lover is punished...

I'm adding this to the LGBTQ+ bookbox, which will be on its way to its next stop soon. Enjoy!

[Update, 8/22: lynmarenjensen reported claiming this from the bookbox.)