Sammy

Befriending Sammy
You will have to frequently visit the bathhouse and shower and talk to her more often until it trigger a scene with her to talk to you and give you the ability to use the VIP section and you would befriend her by then.

Wrestling match
After befriending her, she may be sparred with in the Gym. She's tough opponent (especially since no weapons are allowed), though she would hold back if Lust Doll is pregnant.

Defeating her through physical damage unlocks the Counterattack skill.

Scenes

 * Mess with Sammy from behind the corner.
 * "Special" bath:
 * Normal bath
 * If Lust Doll requests the special bath after annoying Sammy before, it results in a special scene where Sammy punishes them (sexually, of course).
 * If Lust Doll defeats her in a wrestling match through lust, she would complain about you not fighting fair, and would leave to take shower. She may be encountered here, and player is free to join in, resulting in one of the following scenes:
 * Fuck her with your cock
 * Eat her out
 * Tease her feet