Training Gin

This quest starts when you defeat a Wildcat via lust attacks. To find a Wildcat, take a key from Cassie's safehouse, and unlock the gates to the Forest Park; they can attack you as a random encounter. Note that male partners must be enabled.

Meeting Gin
The first Wildcat whom you defeat by lust would freak out, and call that "unfair", because he can't defend against such attacks.

Lust Doll would offer to train him, starting the quest and making that wildcat (who introduces himself as Gin) available for interactions. He would spawn on the Forest Park's entrance.

Early training
At first, only three options are available: use your boobs, butt or feet, which leading to the different scenes. Gin can't be trained more than once per day, so some rest is required before training can be continued.

After repeating the training enough times (at least five times), the option to go further would unlock. However, Gin would freak out at the last moment and run away.

The next day, he can be encountered on the same spot as usually, hiding in the bushes, and you can try to push a bit further again, but his usual shyness would ruin everything at the last moment yet again.

Extensive training
Afterwards, the usual training sessions can be resumed. After a couple of more session, an option to talk to Gin would appear; he would voice his doubts whether these "session" actually help him in any way, or just make the problem worse, because he becomes more and more vulnerable with each one. At that point, Lust Doll would reveal what this is exactly the point: Gin would grow so attached to them, no one else would make him hard ever again, thus making him resistant towards their seducing attempts, which technically still fulfils the agreement. Gin would react negatively, and insist what he "would resist", only to realise what he's barely able. Lust Doll would give him one last chance to consider wether he wants to continue the training: he can run away now, but if he returns, he must stay and finish his training. Gin would run away.

The next day, he would again try to hide in the bushes. When spotted, he would reveal what he's unable to even masturbate by himself: an addiction to Lust Doll is so strong, nothing else can make him cum now. He would try to have sex with them, but nothing would come out of this, as usually. After that, he would reluctantly agree to continue his sessions, now even more lewd than before.

Currently, this is where the quest ends.