Re-posting, since I think the pic I used the first time may have been a bit too explicit for /e/.
Sorry about that.
>>2713834 (OP)I have a stupid Idea, that are way too silly for a guy my age to be writing.
> Being Outclassed by my Little Sisters!MC is what his world calls a “Blessed Child”. Essentially, a person born with a powerful ability, or knowledge they shouldn’t have.
He uses his knowledge about forgotten magic to help his family out of financial trouble, creating new types of magic and magical devices, until his two younger sisters reach their early teenager years and start their magic knight training, as his family has ascended into low nobility.
Their innate talent for magic coupled with what they learned from him, makes them forces to be reckon with that quickly outshine him.
He starts to hate his sisters that always make sure to show how much more powerful than him they are. This eventually drives him to start plotting the downfall of his own sisters. Unfortunately, he could never defeat them in a fair fight, so he first turn his aim towards their friends. Hoping to use them against his sisters.
Initially he is conflicted about what needs to be done to bend their friends to his will, but as he discovers them to be plotting against the kingdom, his resolve strengthens, as he decides his sisters must be stopped, at any cost.
MC is completely unaware that his sisters actually love and respect him very much, and are only showing off in front of him because they want him to see what his creations can actually do, and that he is protecting them from bad people that want to use them for their own gains accidentally.