Nidome no Isekai, Shounen Datta Kare wa Toshiue Kishi ni nari Dekiai Shitekuru

By chance, Sarah is transported to another world, where she saves a young boy named Luke who had collapsed in the forest! However, she is suddenly sent back to her original world...... Three years later, she seems to have been summoned to the other-world again!? And for some reason, there was Luke, who has grown up to become a handsome 26-year-old knight...

"I'm going to dedicate my life to repaying Sarah's kindness," he told her, as her new pampered life begins!

(Source: B's Log Bunko, translated)