I have finally got to those scenes where the mc/captain and Katari get to massage each other, they do achieve sexual satisfaction from the erotic massages.
It is ludicrous and quite dismaying that Katari and the mc/captain are still not going all the way and engaging in full sexual activity.
Katari has stated that he refuses full sex with the mc/captain out of respect and that he is a subordinate lowly mechanic and yet Katari agrees to erotic and sexual massages.
Katari is exceptionally well endowed and he may be concerned the mc/captain may be seriously injured if he tries to top him.