After a lot of consideration, he gives himself supernatural strength, and confidence.

Tsukane looked through the rules carefully, trying to figure out the implications. "Okay..." he mused aloud. "It seems that the Note absolutely requires me to know someone's name and face to affect them, so I couldn't just write, "Every girl who sees me will be irresistibly attracted to me, and want to protect me... So that option is out... Also, Rule 5 mentions precedent with contradicting Sex Notes... That means there's more than one of these... I wonder if any others are in Yokai University..."

He mused a moment more, but continued to consider his options. "But... It seems that this thing has the ability to do just about anything, so long as I have the name and face of the person or persons I want affected, it's physically possible, and has some kind of sexual intent behind it... What about supernaturally possible though?" he wondered. "Moka has absurd strength, being a vampire, but could I make myself that strong?"

It was certainly worth a try... If he could alter his own body... Then he could pass himself off as a monster far easier. But did he want to drastically alter his own body? And what of his mind? He wanted to stay himself, obviously, but even if he made himself powerful enough, what good was it if he was still too much of a scaredy cat to put it to use? He was rather meek, even amongst humans after all... and he also needed a sexual motivation behind it.

After a while of thinking, he came to a decision, and began to write, "Tsukane Aono will gain immense supernatural strength, speed, durability, and perception, the max amount possible for a human being to have. This will all not only make it easier for him to survive and win fights with monsters, but serve as a means of impressing girls, both human and monster. Furthermore, he will also gain boundless confidence that he will have the ability to turn on and off, like a switch in his mind, at will, which he can use to seem much cooler to any girl he wants to attract."

There... If this worked... He'd be able to stand up to the worst monsters with any luck... And the confidence was so his mind was not permanently altered, but rather there to tap into when he needed to act without hesitation. He got that particular idea from Moka's rosary, although instead of a physical item to take off and put on, the confidence would come and go at will. And the sexual part was hopefully covered by the idea that this would make him more appealing to women, as well as that applying to the strength part.

He got the sense it may have actually worked when he felt pinpricks all over his body for about ten seconds, before the sensation faded. Now to put it to the test. He got up, carefully stowing the Sex Note, and dashed briefly for the door. He had it open and was out of the dorm building in just a few seconds. His heart pounded with excitement. He had the speed down, and didn't run into anything in the way, meaning his perception kept up.

He then looked down at the ground, and spotted a sturdy looking stone. He bent down and reached for it, straightening up as he picked up said rock and gazed at it... Before he tightened his grip. Squeezing the rock as hard as he could, it instantly cracked, before it crumbed into dust. With no real struggle on his part at that.

He brushed the dust off of his hand, amazed. "Holy shit... It all actually worked," he laughed. He headed back inside, feeling a little better about his odds of surviving now. He had considered writing up a letter of withdrawal... But now, while he had been certain he was on the bottom of the food chain as a human, he wasn't sure where he stood after using the Note on himself. He decided he'd figure that out tomorrow as he climbed into bed.