Ref. No. 933/41-63 B
In the name of Allah the most Gracious the most Merciful
The answer to your question is as follows:
Hurmate Musaharat takes place by a twelve year old boy too as he is a Murahiq (close to mature and able to feel sexual desire).
کذا تشترط الشھوۃ فی الذکر فلوجامع غیرمراہق زوجۃ ابیہ لم تحرم۔ (در مختار1/188)
For detail click here: https://dud.edu.in/darulifta/?qa=1832/daughter-travelling-travelling-sometimes-feelings-daughter
And Allah knows best
Darul Ifta
Darul Uloom Waqf Deoband