As a copy of Tentacle Locker this looks pretty good! I do appreciate the attempt to add more story and atmosphere to the game. That said, is there any current consideration to adding more mature/buxom girls in the future (mostly likely senior students and/or teachers)?
Also, If you're adding a "don't get caught" condition to the gameplay, will there eventually be a way to prevent girls from noticing the strange antics going on in the hallway? Perhaps allowing the player to trip fire alarms or rattle lockers to misdirect/drive off potential witness, or give the player the the ability to click on a panicked girl and make her psychically "forget" what she saw.