With your IP addresses showing you two as neighbors, or located in the same small area, you could definitely just trade it over. It will appear that your friend is giving you a gift, not that somebody is selling you gold.
It looks MUCH more suspicious to Jagex if they see an IP address from China or Korea trading 2B over to an account from across the world, or if they realize you recieved 2B from an account that is constantly making large, one-sided trades. You will be fine trading it with your neighbor though, nothing to worry about.
If you are that worried, I would stake it over, or get your friend to drop it in low level wildy when you guys are alone, as items dropped in wildy appear instantly.