Marina the swim team captain hates the boys’ team, but when her teammate gets in trouble, she has no choice but to accept the guy captain’s indecent proposal. 
 
(Source: Irodori Comics)

1. Maso Mesu Soap e Youkoso! (マゾメスソープへようこそ！, Welcome to Mega-Slut Soapland!); Doujinshi
 
2. Ore no Koto Daisukina Kouhai ga Riku-bu no Kochi ni Yarareteta Ken (俺のこと大好きな後輩が陸部のコーチにヤられてた件, Crash Course with Coach); Doujinshi
 
3. Kyouei Joshi to Nikushoku Danshi no Waisetsu na Mitsuyaku (競泳女子と肉食男子の猥褻な密約, Indecent Proposal for the Swim Team Captain); Doujinshi

Episode 1 - Maso Mesu Soap e Youkoso! 
Two young girls who were in my charge during the training of new employees. Now that Mitsurugi has gotten used to her job, she is doing great in the secretarial department and has a strong sense of responsibility, earning her a good reputation within the company. Meanwhile, Nagihara is doing solid work with me in the engineering department, and is popular with the male employees for being neat, considerate, and smart. Though they seem like opposites at first glance, they have one thing in common. That is "Mega-Slut Soapland"... the two masochistic women work in this forbidden place. Their masochistic appearance is 180 degrees different from that of our workplace, but is this their true selves!? Actual sex is supposed to be forbidden in this place, but the more the woman is made to cum, the more various services will be released♡ 
 
Episode 2 - Kyouei Joshi to Nikushoku Danshi no Waisetsu na Mitsuyaku 
Marina Hishimori is the captain of the swimming team at a strong school. Beautiful and academically gifted, she's well-liked by her juniors and an excellent coach. This perfect girl looks down on the male team members who try to win by using underhanded tactics. Then one of her favorite team members falls ill with a serious illness. The only doctor who can treat the illness is the grandfather of the team member whom she dislikes. In exchange for expensive treatment, Hishimori ends up signing a "sex friend contract". Will this noble girl be able to get through this sex friend contract...?! 
 
(Source: Mediabank, translated)

Male swimmer