God Hand is probably due to that character being a good massagist/something similar. Or may be refering to her being able to make others cum just by fondling them.
DeepL translates as "God Hand and NTR Oneesan", with no mention to "Nao" (and DeepL is far better at translating than Google), and the thumbnail is pretty clear about what is going on, another female fondling the FMC and the main character somewhat panicking.