Interesting conversation. I agree with most that they did not have SR yet but Gopi got a hint now of what to come when they are intimately close.
Before the stares were satisfying; then the accidental kiss which make both realise their deeper feelings and need for one another
Now the icing of the cake has being tasted and what's remaining is to have that cherry on top.
Too many signs indicated nothing happened like many already listed:
No pain for either
No shower for either
Both were dressed
No smear of lips stick
No body marks
Sindoor and holi colours still in tact
Bed spread smooth to name a few
There are many ways of Ahem suspecting something taken place:
Like others said he did not feel odd knowing he woke up from bed instead of sofa
Usually he take shower first before tea but it's the other way today
How did get dress without thinking how come his kurta was not there
They seem to avoid the broken bangles and pins whilst in bed so no harm from pins
I think what happened was that:
they were so into each other and after breaking the bangle, he got up took off his kurta and due to the bhaang and intoxicating feelings at that moment, he fell asleep on top of Gopi.
As for Gopi she was happy being in his arms and was satisfied with what she got and new her Ahemji was tired after,dancing,playing holi and romancing her. She will cherish this until she finds that he did not remember and you know what she might ask him how he did not but:
The pictures might help him start remembering
The family might start teasing him
he might tell her that after he had laddo he did not remember anything
Gopi might now know how the bhaang got there in the first place
she will then put 2+2= Ahem was drugged and that's why the hype state he was