Read on Futekiya: https://read.futekiya.com/comic/60e6b004ba864 
This is a threesome BL story. which does involves siblings (taboo content) but I was curious to read it. I have read a lot of manga on Futekiya recently and so I went on a search, clicked on high spice manga and searched for the manga that took my interest. This manga has an interesting relationship dynamic. how does the three feel for each other emotionally and the conflicted feeling? I read similar threesome stories before and not all of them were that good in my option.