OK, back to what I wrote earlier, JR & MH were very close & lived together for a long time, they would have had to have shared intimate thoughts, DK might have been a topic in some form. MH could have spoken of DK as some screwed up kid who he is helping, covering up the real reason for them seeing each other
MH was partying that day, he had consumed alcohol, it was late.. assume he was tired, if he had urges, it would have been easier to simply pleasure himself, roll over , go to sleep, ( sorry no offense ) MH was obviously not desperate for sex, experiment or not
The fact that MH left his unit in bare feet after arriving home, seriously makes no sense, if he knew he was going to meet DK why take them off in the first place, & risk of treading in or on something
the only reason I would go outside of my house or yard in bare feet if it was some kind of emergency,
perhaps, MH did not know he was going to see DK that night, DK might have 'forced ' him, by threatening blackmail, here is this womaniser, well liked by all, starting up a business... I don't think this nerdy kid relationship would have been appreciated in his social circle
or - could have been simple, MH ran out of the unit to signal DK that the unit was empty ( JR had not returned) & that it was safe to follow him ( perhpas DK had not been there before)
sorry for long post, this case has so many possibilites, agree with the recent post on here , it will probably be the most simplest of answers to a sensless murder