>>3859708Of the girls I think Rei was disgusted because she just hates him. Yumi was reluctant and being shy like she usually was. Shiho was, "I'm out of your league and I have a fiance though I'm thankful you offered". Akira was just being her usually cold demeanor, and Sensei denied him because, "I'm an adult, and you're a student. This is wrong. I have a husband too." Though it was silly they'd rather die than be saved by him even if the actions to do so were rather dirty.
I think Yumi connected to MC the best because they were both generally weak characters that get pushed around and found common ground to appreciate and develop with each. Shame they killed her in the OVA.
>>3859775OVA's these days don't pull in the $$$ needed for those extra minutes.