Volume 2 is from Kobo and volume 3 is from iBooks.

If there are any other ecchi series that Amazon and Comixology dropped let me know below and I’ll see what I can do to upload them.

The only series I know so far that have are no longer carried by Amazon are:
To Love-ru Darkness (Next Release 10/27/20)
World’s End Harem (Next Release 11/24/20)
World’s End Fantasia (Next Release 10/27/20)
Magika Swordsman and Summoner (Next Release 8/25/20)
Creature Girls: A Hands-On Field Journal in Another World (Next Release 10/13/20)
Saki the Succubus Hungers Tonight (Next Release 8/18/20)
Parallel Paradise (Next Release 10/27/20)
Destiny Lovers (Next Release 10/27/20)