How do I use Android device with USB OTG device as MTP client for another device?

Question

I want this setup:

[My Android device, MTP client] --USB OTG-- [other Android device, MTP server]

For acting as MTP server, one simply chooses something like "Share files with computer running Windows or Mac".

How do I run MTP client for USB OTG connection?

Workaround:

1. Get root;
2. Setup Linux chroot
3. Download and build AFT insde the chroot
4. Use aft-mtp-cli or aft-mtp-mount.

I expect some proper application to use root access to talk to USB and act as MTP client for another device.