I don't think people realize for NTS/NTR to be effective, you need a lot of build-up. You need to know and grow to care for the character and her dynamic with you for the sharing/cheating to matter. Otherwise, it's just a random person getting laid. I'm content with the current pacing and hope the dev will continue not to rush the story.
I actually wish there'd be even more depth to each character - even casual banter has sexual tones or undertones, even though the last update slowed that down as well. I hope we get to know about family, childhood dreams, future jobs, traits and characteristics that add depth to the characters, in particular, Ayumi.