Definitely couldn't wank to this but it was worth reading. The story is honestly nothing special but its nice the girl doesn't just succumb to pleasure and give in. The story never overstays its welcome despite spanning two full tanks. Hikari is well designed so even with all the soft core stimulation, its entertaining to view. It even includes the what if scenarios if people wanted actual penetration for a lot of the situations.
The only minor gripe I have is how fast her master got there to save her. Like yeah, he felt the stalker's message was fishy but given the story implications, he didn't really feel the need to act until he felt Suzuran's desire to be saved when she explained her past to Hikari after she blacked out. It just seemed like he got there too quickly even with the assumption that he located her due to Suzuran's fervent desire to be saved leaking out with Hikari's own desire.
Still can't emphasize how much they knocked it out of the park with Hikari's design. Her body type is not usually one that gets me going so the initial premise is what hooked me in. But I ended up staying for the story and to see more of Hikari in various situations.