first you need to get the "Corrupted Logan". Encourage him to go to bandit camp. Then, there is gonna be a scene where he and the fat bandit have sex in sawmill on night. after that there must be outdoor fun scene with him, i guess. if there isn't, try to change your character position as a top/versatile.
You don't need to have that route. My idea for Logan stays the same - it's going to take some time to romance him but player will eventually get there.
But there were a lot of people asking for submissive Logan, so... that route appeared mostly because people wanted it.
So it's a choice. Encourage Logan to go to the camp (Then that happens), discourage him from going to the camp (You have normal route I had planned from the start).