I will admit, I'm more into Mark's slutty escapades, but if you're a fan of Allen's bro energy, or the concept of a silver fox power bottom who talks like Optimus Prime, then you will still find something of value in this comic. If Mark X William is Mark's sequel to Mark X Allen Part 2, then this can serve as Allen's sequel, showing that even when they're apart our heroes are gonna continue having all manner of sexy adventures.
I have written already about just how good MidNyte is at making his comic versions still feel like their canon selves (just gay-er/bi-er & lot more horny) and we very much see that in action here. It is such an Allen thing to be summoned to meet with Thaedus, who is waiting for him buck naked in a hot tub and still accept Thaedus' explanation that they need to have sex for "training" at face value. Thaedus meanwhile is giving off powerful Power Bottom vibes. A part of me wonders just how long he's been craving a partner strong enough to really pound that hole... The major emphasis on strength is also canon to both (albeit a lot more fetishistic for Thaedus than canon would suggest) & I respect that Allen's girlfriend is acknowledged (like Mark, MidNyte Allen is evidently Bi, not Gay).
The sex utilises MidNyte's usual skill with moisture & is a study in some of the many ways a Silver Fox bottom, can coach a muscle bro through absolutely destroying his hole. There is such an emphasis on going harder, that I suspect Thaedus has a long unfulfilled masochistic streak that Allen is finally indulging for him.
So yeah, a decent little addition to the MidNyte Invincible Universe that's worth having in your collection.