If you're looking for a futanari manga comic hub that just makes it easy for you to get your hands on what you want, this is likely the place for you. Specific requests are quite easy to satisfy on H Browse - the collection is very much focused on making access to the porn the number one priority of the archive.
How is this achieved, exactly? Well, I think the advanced search here is better than any I've seen on a rival site. It allows you to include what you like in terms of categories, but also exclude certain niches (furry, golden showers, etc.) that are not at all relevant to your interests. It has a very clean site display too, so you get to look at the material without running into problems or issues with not being able to place what it is you want to do under your mouse cursor.
The archive is a little on the small side here and with more releases, I'd really rate this place as a top-tier destination to find futanari pleasures.