NT00 made clear that they are 'soulmates' power of love blabla , true NTR can't happen anymore imo , and if it happens that would be a 5years retcons lol .
I don't know what side of Yuumi can be different and fresh in no delusion , just hope it's not hints to Yuumi being 'frustated' with Haru and kinda want/need other guys to feel 'full' , Netorare no tami did go for this and failed hard.
I love hardcore depressing NTR but after all these years , i kinda care for Yuumi/Haru and i just want to see a nice ending kek