"Look, Riddle is going to find us and there's nothing we can do about it. I don't know if we can trust Sirius or Remus, but I would like to believe we can. Sirius still thinks he's the secret-keeper, but he's not. Lily tweaked the fidelius charm so that he would still remember our location, but not be able to tell anyone. I hope with our new choice that we've made the right decision. If we haven't though we want to know that Harry will be taken care of. I know you both want to be out there fighting alongside the Order of the Phoenix, but aside from our friends you're the only people we trust to raise him. If you were to go under the fidelius with either Lily or I as the secret keeper then no one would be able to find you. We know we're asking a lot of both of you and we understand if it's too much." James assured and looked at the younger boys anxiously.
The boys looked at each other and silently communicated what they should do about it. On the one hand they really wanted to fight and help catch death eaters, on the other hand though James and Lily were trusting them with Harry.
In their first year older Slytherin boys, that were now death eaters, had attacked them. The only thing that saved them until Lily heard the commotion and intervened was the charms placed on their heir rings. With twins usually the oldest would be the heir to the family line, but their Dad didn't want to cause a rift. On their eleventh birthday that had been their main present along with books that prepared them for how things would work.
During their second year is when they became close to James. While they had respected Severus because he was friends with Lily when he had called her a mudblood all bets were off. Until that point they had avoided James, agreeing with Lily that he unneccessarily bullied Severus, but they knew he was better equipped to carry out the prank they had in mind. The boys had a knack for inventing things and tweaking things that were already invented. They'd approached James and offered a joining of forces. When James heard their plan he'd agreed and left Sirius out because he was pouting about including the younger kids. Using James's invisibility cloak they'd waited patiently by the Slytherin dorms and entered behind a large group kneeling in a corner out of the way. That night when Snape had went to bed they'd followed him up the stairs and into his room. Once they were certain all the Slytherins were asleep they'd cast a silencing and muffling charm before opening Snape's trunk and removin his clothes. Quickly before anyone woke up the twins had poured three drops of the potion onto each piece of clothing. As soon as the clothes were safely back in his trunk they exited and got out of their as fast as possible.
It had taken weeks for the professors to figure out what was going on and Snape had been shunned by the older Slytherins. The potion had blocked his magic from working, caused him to report any wrong doings of the Slytherins, and forced him to attack anyone that used the word mudblood. It had an unforeseen outcome though in that it showed him just how far he'd fallen and made Riddle's people avoid him. He reconciled with Lily and ended up become close to James and Remus though he was always cautious of Sirius. He'd left early by taking his exams and started his mastery for potions. From time to time he'd even write them for their help and try to convince them to become his apprentices. Having made up their minds they looked back at James who looked even more nervous.