Mari is even running away at the end.
Oh, come the **** on. She's GOING TO WORK. She was already about to leave before the GOODBYE CLOTHED SEX. They had GOODBYE CLOTHED SEX. She then proceeds to leave, because the point of a goodbye kiss or GOODBYE CLOTHED SEX is that it happens right before you say goodbye. Alisa says "take care", like you would when saying goodbye to somebody because they're going to work.
You're completely detached from reality if you think couples having sex without signing a contract before every incident is sexual abuse. Mari already said she was fine with it and was simply too embarassed to take off her clothes in a previous chapter; you're marring the seriousness of allegations of real sexual abuse by so frivolously calling this abuse.