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The first one is based on a story where he's worried on his wedding day and he accidentally pees himself and his sister helps get his pants off so he can clean up. His sister Winry is also pretty into his weenie, so she's been thinking on it and enlisted Nishi to help her out with it. He's got plenty of pictures of their nakie parts to help her get off, but then Nishi and Winry decide to just have fun, and Nishi lets her pretend he's her brother so she can get off on their fun. And then Yosh walks in on them - and I was about to fall asleep so the last panels look goofy.
The second comic is just an idea I love, where Nishi and Yosh head to a nude beach and Yosh is all embarrassed about it. Nishi decides to put a little cloth over Yosh's weenie to keep him covered, and let him do as much as he wants while he's there, in a subtle way so people don't exactly see their mess. I always get all sleepy by the end of these so it ended early and lazy sorry.
And then the last two images are from one of my favorite comics posted here with Yosh, where Nishi pressures him to strip out of all his clothes in front of his sister, and then humps at his rump until eventually Yosh springs out and cums right in front of her. All kinda outta nowhere! So here's a nicer-colored version of it, since a lot of these are just rushed color to make it easier to see what the heck is happening in these comics.