Thanks for the chapter, Monkey_D-Thanos
Now we know the answer for mum's complaint in chapter 2. Dad's knees and back can only hold out two out of three times.
Dad's live reaction for the one out of three times he can't hold on
Live reaction for all possibilities the next morning.
Rule of Someone-or-Other: "In any manga where the main topic of jokes is sex, it is only a matter of time before the main male character is estabilished as a masochist"
Here it only took three chapters, might be a new record