Super sales on super heroes.
https://smile.amazon.com/dp/B072HQF1B6/ref=cm_sw_r_cp_apa_r67KFbFE6K9B6.
Try William D. Arand or his other pen name Randi Darren. The basic difference is Randi Darren is more adult as far as sex and violence go's. Most of the books have some connection to his overall multiverse so the world building is quite good since he try's to make it consistent. Some of the harems are large but there is actual character development and character arcs. My personal favorite are Super Sales on Super Heroes, and Monsters Mercy. https://www.amazon.com/gp/product/B072HQF1B6?notRedirectToSDP=1&ref_=dbs_mng_calw_0&storeType=ebooks
https://www.amazon.com/gp/product/B0826MNGVS/ref=dbs_a_def_rwt_hsch_vapi_tkin_p1_i4
A special mention to to the VeilVerse which includes Cultivating Chaos and Asgard Awakening, which he writes as two interlocking trilogy's with Blaise Corvin. Its not in his overall multiverse but is a very good western take on the wuxia genre. Basicly its a harem story about two cousins that get sent to a different world, but separated. Arand writes about one and Corvin writes about the other. It works really well and it looks like its open to other authors to write in as well as John Van Stry wrote Take Two in the VeilVerse as well. https://www.amazon.com/gp/product/B07KFLSC27?notRedirectToSDP=1&ref_=dbs_mng_calw_0&storeType=ebooks
All on Kindle Unlimited.
So how else to describe Super Sales on Super Heroes? Should I just say I like it? I feel like that doesn't convey my relationship to that book...
This sounds a lot like Super Sales on Super Heroes. https://www.amazon.com/gp/product/B072HQF1B6/
https://smile.amazon.co.uk/Super-Sales-Heroes-William-Arand-ebook/dp/B072HQF1B6 Superhero basebuilding/harem.
https://smile.amazon.co.uk/gp/product/B08594L5X1/ref=ku_mi_rw_edp_ku - Watchers test - your standard Isekai to a fantasy world, but his family goes along - occasional chapters from their POV, but they are very much core to the books.
Wiliam D Arand has various cross-universe works.
https://smile.amazon.co.uk/Super-Sales-Heroes-William-Arand-ebook/dp/B072HQF1B6 is one of the 'offshoot' works.
I did not in general feel this added to the individual books.
Want at least 100+ Slav Doggo Girl Vibes? Andrea/Myriad from William Arand's Super Sales on Super Heroes would fit the bill. https://www.amazon.com/Super-Sales-Heroes-William-Arand-ebook/dp/B072HQF1B6
Hmmm, it is super hero genre, not magic, but the MC in Super Sales on Super Heroes has a pretty unique power
fun ones you might like are Super Sales on Super Heroes by William D. Arand or the Waldo Rabbit series by Nelson Chereta