Leomon was not a good person. In anyway. He pretended to be one, but he routinely raped and then killed hundreds of "lesser digimon". He didn't even absorb the data, he just did it to satiate his urges. And now that code was starting to wake up inside of Impmon. At first, it hadn't been very much, so he didn't mind. His attacks seemed to be a little different, and on occasion he sounded like him. That was before Leomon's... more violent tendencies started to infect him.
He regularly started to use his Leomon's attacks, even without intending to, sometimes just because he was angry they would trigger. And the unbearable urge to mate, particularly when it came to Jeri. After those urges came he started to realized he probably did Jeri a service killing Leomon, because if he hadn't then Jeri would probably be stuck somewhere in the digital world, Leomon fucking her three times a day, with him pretending to be upset so he can stay around her friends as he 'heroically' leads the fight to find Jeri, so that when the time comes and he finally gets bored and kills her he can do the same to them one by one.
Impmon's currently sitting in his tamers' bathroom at night,aroused looking at a picture of Jeri, he swiped from her room when he broke in earlier, gripping his hemipenis, wondering if it would be wrong for him to try to convince Jeri have sex with him. They are both the same age after all, roughly13. His current dick would probably rip her apart though, being another 'asset' he got from Leomon, with full blown spikes on it. He could try to shift it back to his own dick, but with how hard it is to hold back the attacks he doubts he could do it during the throes of passion. And besides, while his dick is much more manageable, with spikes like a regular house cat, it would still be very uncomfortable for her. Assuming he could convince her to, which he knows he couldn't. She still thinks Leomon was a good person. And even if she knew, she's a smart girl, which is part of what makes her so attractive, oh yeah, so pretty too❤, she could figure out that he didn't know that at the time. Maybe he could try to play to the fact that Leomons part of him, and that part wants to or is intensifying his want. But she would never believe that, and even if she did she would never have feelings towards Leomon, and besides that's emotional manipulation,he's better than Leomon. He'll figure something out. How to get rid of Leomon's code,how to get into Jeri's pants, both? Only time will tell.
No, Impmon is not going to rape Jeri. Leomon was just an asshole who couldn't control his urges.