But Heinrich's boss did not send him to St. Petersburg, that's my point! He had to scheme and maneuver and outwit Fritz, who was resentful! And that's what I imagine getting Mara to STFU already and spread his legs was like: having to use all your wits and force of personality and WINNING.

Heinrich as pushy bottom who likes submitting is not my headcanon; I think he lost too much in real life for that to be satisfying (see also truncated pyramid).

But also sexual kinks are weird and arbitrary, so who knows. He could have had any tastes!