There are many characters in the OTW series, but I realized that there aren’t actually that many characters or pairings suitable for NSFW content. (Eight in the main series, two in the spin-offs.)
That said, I’m personally very satisfied with it.
BUCK × White Fang
1: The stylishness of just the silhouette and the hint of eroticism. I just can't get enough of this contrast.
2: Afterward. Having finally been released from their long union, the two of them are sprawled on the bed, still basking in the afterglow of pleasure. BUCK’s penis, now withdrawn, is exposed, and the sheets are a mess from their spilled bodily fluids, but they don’t seem to have the energy to worry about any of that right now.
3〜4: Since their bodies are so well-matched, they can experience sufficient pleasure simply from the contact, sensation, and heat between their genitals, even without vigorous movement. Furthermore, the strong vaginal contraction caused by White Fang’s well-developed lower-body muscles provides BUCK with the most intense pleasure. This mutual interaction brings them both to a climax.
5〜9: It’s well known within OTW that BUCK and White Fang are soulmates, yet no matter how much time passes, they still act just like a couple in the early stages of their first romance. MAMI, who’s been getting a little impatient watching them like this, decides to give them a little nudge.
It might seem that way here, but MAMI isn’t actually an insensitive character. She’s just naturally curious about other people’s love lives. Plus, while she’s open-minded about sex, she’s not promiscuous.
Ladies
10〜13: I get the feeling this trio is probably quite popular among the supporters.
White Fang and Kasugai are among the most formidable fighters in OTW, but in Mami’s hands, she can take them down with one hand. That’s because she knows all their weaknesses—weaknesses that even those who’ve fought them wouldn’t be aware of.
(Incidentally, Mami herself is such a skilled Pokemon battler that she serves as the ace of Team Amber. It’s just that White Fang and Kasugai possess combat abilities—including the ability to kill—so their capabilities go beyond the scope of Pokemon battles.)
Zara × Lilian
In the case of these two, Zara generally holds the upper hand, but I especially like how he sometimes loses his composure, or how Lilian gets motivated and effectively turns the tables on him.
Underwater scenes are like the inner worlds of Lilian and Zara; they are often used to represent their inner emotions and states of mind, or as scenes that connect these elements.