It can be if the Pokémon who are successful in getting the MC to cum get it on their body and react like a badge of completion and commenting on to show it off the the others to make them jealous. I also had an Idea of a plot point at the near end of journey where all areas have been visited and a organization kidnap's the MC but he is quickly rescued by all the Pokémon that have joined him thought the journey and they comment "No one will take away our master/hubby". It could also be the place where the legendary Pokémon form, Pokémon Uranium, could be put in even though that game is not listed as an official Pokémon game. It would be interesting to have Urayne in the story since its a man made Pokémon like Mew Two.
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This sounds like a good excuse to make more images of cum covered Legends, writing them being all prideful and victorious could he fun too.
I like the MC gets kidnapped plot, maybe it could be a way to get Rainbow Rocket into the story? I'll think about it.
I've never played Pokemon Uranium, so that's not happening I'm afraid
After the MC gets rescued professor Maple could be worried about the Pokémon on the boat so gets a bigger boat that can ensure their safety in their pregnant condition and comfort. This can allow a upgrade of the MC bed where it can expand as needed (could open night visits?), be made of super reinforced material and able to withstand a Richter scale of 9 "Rocking" on it. The part where almost all the Pokémon snuggled with the MC and almost broke the bed was fabulously done and I loved it. With the size of some of the girls a bigger boat will likely be needed in the future. Your work on this game so far is five stars.
I have even more ideas!
When Regigigas arrives on the ship or maybe after she gives birth she could have a lot of stored information about ancient advanced technology that with the other three Regi's to construct a holo deck to perform "more efficient data collection". This could allow the legendries to have roleplay parts. Lugia in sexy teacher outfit and can say "You have been a bad student and need to be punished, you will do as I say". Raikou can be in sexy exercise outfit. Articuno feels like a sexy librarian outfit would fit on her and could say "Your book is overdue, pay the fee anyway you can". Suicune in distressed royalty outfit. A leopard bikini for one of the Pokémon. They can do a striptease with the holo cloths. The holo deck could simulate different environments like zero gravity, floating in the air, underwater without drowning, and more since it is very flexible to the imagination.
When Palkia joins she can modify the interior of the ship to be bigger since she controls space and would comment on it being to cramped for her liking but need "compensation" to do more.
An idea with the human relationship would be with Officer Jenny and her Growlthe and Nurse Jenny and her Chansy to help start the next generation of nurses and police. The MC reputation would have already become known to them and not turn away their Pokémon have childern as well as long as he has the right legendary as usual.
The MC could give a massage to his Pokémon.
A question is how far do you plan to take the incest? Will it be just brother and sister or could it go to mother and daughter or Father and daughter?