Though Raavi was scared but she was not averse or not ready, to the idea of having SR.
Being scared and Being averse are 2 different things.
Raavi being scared is very natural because it is something special especially Shiva took the kasam that they will go ahead with the relationship only when he makes her wear the payal but he created a loop hole by saying winning the competition is almost equal to him getting ahead in his education😆
As for Shiva, don't think he was ready for it yet, that's why he asked Gombi, "bina pooche aise koi karta hai kya' regarding the arrangements.
The only thing that made him go ahead is Raavi initiating it and finally knew she was ready for it.
Unpopular opinion - I feel shiva was ready for physical intimacy even on their SR after 2nd marriage.. He did try to initiate but Raavi told him to win her heart first( he deserved that after all the kaands he did) . He was shy and awkward but i think he wanted physical intimacy. He decided to not take this step before proving himself because he felt bad that Raavi was insulted because of him. Ussne yeh bola bhi tha ki usse uski beizzati ka bura nahi laga lekin bura laga isliye kyunki Raavi ko sunna para.