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The Deep-Sea Nian Monster Loves Bull XXXX...
Chapters 8 & 8.2
Seme is a sea monster with human form with 2-4 arms,horn,gills, cloaca!! and two inhuman penises Uke has animal characteristics of a white ox/bull like ears and horn, can transform totally into bull
Double peneration
Slim shorter seme x Beefy(literally) uke
brief cloaca sex, breast growth, breastfeeding/male lactation, nipple play, anal sex, dub/con it’s fairly wholesome, implied future mpreg
Probably my favorite on the list

Genshin impact doujin series
Multiple ships/group sex(all have Aether) but this is only about
Chp.5 Zhongli x Aether(Sweet Fever Return)
Warning: promiscuous uke, chapter starts with previous 3p
Zhongli has one penis that becomes two (human looking) when he takes on his dragon form with pointed ears, scales, claws/darken arms
Double penetration but seme mostly uses one penis
possible mpreg(uke grows a uterus), womb tattoo,egg laying(non viable)
(there’s more but not consistently)

UKE has animal characteristics of snake like scaly feeling skin, being cold blooded, forked tongue with 2(human looking) dicks/hemipenes
No double peneration!
Seme is a wolf(darker furred limbs, wolf ears and claws, fangs) and holy knight for the church

Dubcon, slavery,self inflicted and other violence,discrimination,religious themes

Honorable mention
has a single page where the monster seme is explicitly shown with two humanish penises
possibly has double peneration but I don’t think so
Uke is a cursed human king
Monsterfucking(obviously!!), Rape to later Dubious Consent(or maybe Mindbreak depending on how you feel), tentacle-like tongue rape, violence/dismemberment

Animal characteristic-snake…Seme is a snake god and uke is a sacrifice. Seme confirms having two penises in last chapter but this is censored!! We don’t see them explicitly but I feel like there’s probably double peneration and they’re anatomically correct
Monsterfucking, consensual, implied future Mpreg
This is cute no real red flags(to me at least) except unclear age of student uke
Easy cute read

Dragon Seme has horns, pointed ears, and a cute small dragon form. The uke is human. Seme has two penises(final chapter) for impregnating, usually has one, double peneration!
Womb tattoo,marriage, mpreg/eggpreg, dubcon to con, tentacle rape

Twin student semes have the animal characteristics of a snake and bodyguard uke has that of a rabbit. Semes human forms have slitted yellow eyes and scaly skin. They are one two headed snake in beast form with two snake penises. Rabbit has ears and tail at will.
Mpreg possible
Confusing translation
3p,censored,double penetration!(two ways), dubcon
Big buff uke x smaller semes

(Not ready to read it yet, brief description is snake Seme with two penises)

Seme is an alien, he has one for impregnating(ovipositor) and the other for pleasure, it’s also censored!
this one has some weird vibes especially bc of earlier translations(racist translator) and the whole landowner/slave thing and forcing eggpreg, mindbreak (in my opinion), rape/dubcon the uke did not know why this was happening
Double dicking is in chp 12

Supreme Crossbreeding: The Hermaphronymph and the Double-Dick Dragonkin
Seme has dragon characteristics like pointed ears, grey skin and two ridged penises. His dragon form is briefly seen but all sex is in humanoid form
Mpreg possible, double penetration!(uke has both penis and vagina, so anal and vaginal sex)
(Need to find new link since b@to is gone)