UMD-479: Am ryw reswm, dilynodd fy chwaer-yng-nghyfraith fi ar drip poeth yn y gwanwyn heb ddŵr i'm chwaer, ac roedd gen i chwaer yng nghyfraith lesbiaidd 3P

For some reason, my sister-in-law followed me on a hot spring trip without water for my sister, and I had a sister-in-law lesbian 3P