Please let me pay with 〜せてください
Grammar Explanation: Please let me with 〜させてください

To help ease Kanami’s sorrow due to her situation in life, Makoto offers to let her rent time with him as an older brother. On the first rental, Kanae says she will pay him, something Makoto wasn’t expecting.
- 叶実:
- 「レンタルはお金がかかります」
- “A rental costs money.”
- 「だからお金払わせてください」
- “Therefore, please let me pay.”
The verb 払う becomes the causative 払せる.